Can't initiate virtual machine's console after upgrading rhevm system

Issue

• After upgrading rhvem system from 3.3 to 3.4 the VM's console cannot be opened using the console icon on RHEV-M gui with the following message:

Error while executing action: A Request to the Server failed with the following Status Code: 500

• The message from server.log shows the following ERROR line:

YYYY-MM-DD HH:MM:SS,### ERROR [org.jboss.as.ejb3.invocation] (ajp-/127.0.0.1:8702-6) JBAS014134: EJB Invocation failed on component Backend for method public abstract org.ovirt.engine.core.common.queries.VdcQueryReturnValue or
g.ovirt.engine.core.common.interfaces.BackendLocal.runQuery(org.ovirt.engine.core.common.queries.VdcQueryType,org.ovirt.engine.core.common.queries.VdcQueryParametersBase): javax.ejb.EJBException: JBAS014580: Unexpected Error
..snip
..snip
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.2.Final-redhat-1]
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInNoTx(CMTTxInterceptor.java:259) [jboss-as-ejb3.jar:7.4.1.Final-redhat-3]
        ... 62 more
Caused by: java.lang.RuntimeException: java.io.FileNotFoundException: /etc/pki/ovirt-engine/ca.pem (Permission denied)
        at org.ovirt.engine.core.utils.PKIResources$Resource.<init>(PKIResources.java:97) [utils.jar:]
        at org.ovirt.engine.core.utils.PKIResources$Resource.<clinit>(PKIResources.java:83) [utils.jar:]
        ... 95 more
Caused by: java.io.FileNotFoundException: /etc/pki/ovirt-engine/ca.pem (Permission denied)
        at java.io.FileInputStream.open(Native Method) [rt.jar:1.7.0_71]
        at java.io.FileInputStream.<init>(FileInputStream.java:146) [rt.jar:1.7.0_71]
        at org.ovirt.engine.core.utils.PKIResources$Resource.<init>(PKIResources.java:91) [utils.jar:]
        ... 96 more
..snip
..snip
YYYY-MM-DD HH:MM:SS,### WARN [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/ovirt-engine/services].[pki-resource]] (ajp-/127.0.0.1:8702-3) JBWEB000234: Servlet pki-resource is currently unavailable